Difference between revisions of "Lava"

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'''Lava''' is molten rock from the Earths Core.  Lava's differ in chemical composition, but most forms of lava average 3000-4000 degress fahrenheit.  Lava's can be rhyolitic in composition.   Lava has only been observed on earth and other planets to emanate from a planetary core through ruptures in the planetary crust.   One notable exception was the Biblical account of [[Sodom]] and [[Gommorah]], in which God is claimed to cause lava to materialize over a large area of two cities from the sky. No such phenomena has been observed in modern times.
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[[Image:Lava.jpg|thumb|300px|Lava moves across the ground as a [[pahoehoe]] flow, Kilauea Volcano, Hawai`i]]
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'''Lava''' is the term for [[magma]] from the [[Earth]]'s [[mantle]] when it erupts onto the Earth's surface. Lava differs from magma in that it contains less dissolved gases, due to the decreased pressure at the surface. [[Geologists]] also use the word to describe the solidified deposits of lava flows and fragments hurled into the air by explosive eruptions (for example, [[lava bombs]] or blocks).
  
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'''Lava''' is molten rock from the Earth's Core.  Lavas differ in chemical composition, but most forms of lava average 3000-4000 degrees Fahrenheit.   Lavas can be rhyolitic in composition.   Lava has only been observed on earth and other planets to emanate from a planetary core through ruptures in the planetary crust.  One notable exception was the Biblical account of [[Sodom]] and [[Gomorrah]], in which God is claimed to cause lava to materialize over a large area of two cities from the sky. No such phenomenon has been observed in modern times.
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Lavas differ in chemical composition, but most forms of lava average 3000-4000 degrees [[Fahrenheit]]. Lavas are classified into the following categories based on their chemical composition: [[Basalt]] ([[Hawaii]]an [[volcano]]es), [[Andesite]] ([[Andes]] Mountains), [[Dacite]] ([[Mt. St. Helens]]), or [[Rhyolite]] ([[Yellowstone National Park|Yellowstone]] [[caldera]]). Lava flow is classified into two types: [[pahoehoe]], which has low viscosity and moves quickly in roping patterns, and [[aa]], which moves slowly by crumbling over itself.
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A person can generally get as close as 1.5 metres to a lava flow before his clothes ignite.
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[[Category:Igneous Rocks]]

Latest revision as of 16:38, June 28, 2016

Lava moves across the ground as a pahoehoe flow, Kilauea Volcano, Hawai`i

Lava is the term for magma from the Earth's mantle when it erupts onto the Earth's surface. Lava differs from magma in that it contains less dissolved gases, due to the decreased pressure at the surface. Geologists also use the word to describe the solidified deposits of lava flows and fragments hurled into the air by explosive eruptions (for example, lava bombs or blocks).

Lavas differ in chemical composition, but most forms of lava average 3000-4000 degrees Fahrenheit. Lavas are classified into the following categories based on their chemical composition: Basalt (Hawaiian volcanoes), Andesite (Andes Mountains), Dacite (Mt. St. Helens), or Rhyolite (Yellowstone caldera). Lava flow is classified into two types: pahoehoe, which has low viscosity and moves quickly in roping patterns, and aa, which moves slowly by crumbling over itself.

A person can generally get as close as 1.5 metres to a lava flow before his clothes ignite.

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